Dynamo-electric machine.



'J. BURKE.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED SEPT. 23, 1907.

Patented July 23, 1912.

5 SHEETS-SHEET 1.

I 3/ M 8mm;

@1513 i ljww J. BURKE.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED SEPT. 23, 1007.

Patented July 23, 1912.

5 SHEETSSHEBT 2.-

wit name) J @WQ/ MAJ:

J. BURKE.

DYNAMO ELECTRIC MACHINE. APPLIOATION FILED SEPT. 23, 1907 1,033,379. Patented July 28,1912.

5 SHEETS-SHEET s.

witnesses J. BURKE.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILEDSEPT. 23, 1907. I 1,033,379, Patented July 23,1912.

' 5 SHEETSSEEET4.

7 3y 66f I J; BURKE.

DYNAMO ELECTRIC MACHINE. APPLICATION FILED $39123, 1907 Patented July 23, 1912.

5 SHEETS-SHEET 5.

UNITED s'ra'rns PATENT oE IoE.

.rAivrns BURK E ERIE, PENNSYLVANIA, ASSIGNOR T0 BURKE ELECTRIC COMPANY,

, A CORPORATION or PENNSYLVANIA.

ynamo-E ECTRIC MACHINE.

Specification of Letters Patent.-

Patented J u1y*23', 1912.

To all whom itmdy concerm v Be it known that I, JAMES BURKE, a citizen of the United States,residing at Erie, in

the county of Erie and State of Pennsylva- .nia, have invented certain new "and useful Improvements in Dynamo Electric Machines, of which the following is/a full,-

clear, and exact specification.

My mvent on relates to dynamo electric machines, and to various features of con-' struction, the object of my invention being in general the construction of machines which will have a high degree of efliciency, oe well ventilated throughout, and simple and economical in construction, together with securing machines of greatstrength in all parts. i

One of theimportant features of the invention relates to the construction and arrangement of the laminae.

Prior to my inventlomit has been customary to build up the laminated portion of circular segments when the size of the machine has been so large as to make it desirablet'o use the segmental construction instead of using laminae stamped in one piece. By my invention, the form of the segments instead of being circular on the inner and outer periphery is straight on one side, orsubstahtially so. With this form .of laminae there is a considerable saving in material, as a larger number of laminae may be stamped from the same amount of materlal than'when using prior forms of construction, as'.w1ll afterward be explained. Also the segments may be so designed as to use the same die for all segments, and also secure a break jointarrangement in assembly. Furthermore the form is such that by my preferred form of assembly, a greatlyincreased radiating-surface is obtained.

My invention is also applicable to small machines in which the complete lamina is stamped in one piece.

Another feature of my invention relates to the form of the supporting frame and to means for clampingthelaminze together in an axial direction. and for locking the laminae in position.

Another feature of my invention relates to the construction of the field pole with a view to securing ample ventilation of the pole pieces and of the field windings; also a form of construction which may be easily v assembled and secure a high degree of'me-- chanical strength.

Other important advantagesand objects will be understood by those skilled in the art. I

My inventionwill be understood from the following description and accompanying drawings, in which Figure l is aside view, partly in section, of one form of machine embodying'my invention and with the" revolving element removed; Fig. 2 is a sectional view on line 2 2 of Fig. land showing part of the revolving element in section; Fig. 3 is a sectional view of part of the stationary element showing the form of the laminae, the method of assembling and supporting means; Fig. t is a diagram showing the'preferred form of Fig. 3 and the preferable arrangement in dividing the strips of sheet metal; Fig. 5 is a side view of the outsideclam'ping pieces for ments inplaoe; Fig. 6 is aplan view of the clamping segments looking from the axis of the machine; Fig. 7 is a side view of a por tion' of the rotating field element showing another form and arrangement of segments; Fig. 8 is a sectional View on line 88 of Fig. 7; Fig. 9 is a side ;view of one of the field side view of the end plateand coil support; Fig. 11 is a bottom plan view of the same; Fig. 12 is a front view of one of the laLr-ninae a plan andside View of one of'the separators in field frame of the rotating element; Fig. 15 is a sectional View of a modified form of stationary element showing the form and-manner of assembling the laminae;

cation; and Fig. 17 is a side view with some parts removed of another modification, and showingone feature of my invention applied to a revolving element as distinguished from applicationto a stationary element.

Referring to the construction of the sta- .ti'onary elementof Figs. 1 and 2, the suption as shown in Fig. 2, and provided with numerous openings 1 for ventilation. With- [211 the frame is formed mtegrally therewith blanks for the form. of segment shown in.

holding the laminae of the stationary elepoles with the coils removed; Fig. 10 is a,

of which the field poles are built up; Fig, 13 shows a side and plan view of one'of the separators for the field poles; Fig. 14 shows Fig. 16 is a similar view of another modifi-' porting frame is in general til-shaped in'sec I an intermediate plate 2extending circumferentially within the frame. This plate serves as one of the side supports for; the

laminae as shown in Fig. 2, and is provided with ventilating openings 3 and strengthened by the ribs t between this plate and the other side of the frame. Withinthe main frame is a series ofribs having keys 6 upon which latter the laminze are built up. Instead of using plates with through clamping bolts or other usual clamping means, 1 provide a series of clamping plates with adjustable means between them and an outerafterthe final adjustment is attained and the machine is completed the projecting heads 11 may be cut off flush with the side of the frame. W'ith this form of construction all bolts or other parts passing through the laminae are avoided, the laminzb may be easily and quickly clamped together without the use of special tools and which is frequently a matter of ditliculty with large machines, and the construction also serves a desirable permanent clamping means and which if necessary will allow the machine to be easily disassembled and reassembled, the devices necessary remaining as a permanent part of the machine. The clamps I are provided with tongues 12 adapted to engage grooves'in the adjacent clamps which assist inretaining the clamps in their proper position, and to furtherhold the clamps in place a bolt 13 engages the inner side of the ribs on adjoining clamps, the bolts passing through the keys 6, as shown in Figs. 5 and 6. v

On the inner faces of the ribs 5, which faces are finished with a curvature eorre sponding to that of a circle having the center that of the revolving element, are secured the keys 6 which locate the laminae. Each key 6 has a projecting face 7 which engages the finished face of the rib, and is fixed in position by screws 8. tOwing to the curvature of the faces of the ribs, the keys may be readily adjusted to their proper angular positions before being fixed in place, as the radial distance of the keys from the center is always the same for each position on the face of the rib. This arrangement of keys for locating the laminae obviates the necessity of providing accurately finished surfaces on the ribs for receiving the laminae, and provides a simple and efl'ective means for PI'OPOIly locating and supporting the laminae.

The form of the laminae is ii'ldicated in Fig 3 and as having the usual toothed por- 1 tion. The opposite edge of each lamina however, forms a straight line as distinguished from the usual curved edge. In the form shown in Fig. 3, each lamina extends from one key 6 to the adjacent key, but instead of extending to the center of each key, the end 9 falls considerably short of the middle of the key while the end 10 extends a corresponding distancebeyond the middle of the key. Also the lamina is made of greater width at one end by reason of the extension 1]. which has a greater width than the corresponding part 12 at the opposite end. With this form of lainina it will be seen that as adjoining laminae are assembled end to end, a complete ring will be formed embracing the keys 6. In forming the next layer, the laminae are reversed, and. conse uently take the position indicated b dottet lines in Fi 3 resultin in a break joint arrangement as shown, and further resulting in an outer periphery of the assembled laminae which is grooved throughout by reason ofthe extensions 11 of one layer extending beyond the parts 12 of the next layer-and similarly extensions 11 of the succeeding layer extend beyond the parts 12 of adjoining layers. Instead of reversing each layer several adjoining layers may be assembled in the same way followed by several reversed layers and so on, but with the form cf'laminae shown in 3 I prefer to reverse successive layers. It will be seen by this form of construction thata very large radiating surface is formed on the outer surfaces ofthe assembled laminze. and by reason of the free circulation of air tl'irouglrthe main frame, the ventilation and radiation of heat is greatly improved. The laminae may be divided into sections which. are separated from each other by any desired form of separators 13.

"Another -important advantage of my im proved form of laminae, is the economy effected in stamping the laminze from the sheet metal. In usual constructions, the outer and inner edges are curved in arcs corresponding to the diameters, and in stamping such form, a considerable waste of metal is usually involved, especially in the smaller sizes of machines. With my form of laminae however, the straight outer edge allows the laminze to be stamped with a very small amount of waste material; for example, with theform shown in Fig. 8, the general outline is such that with a certain width of sheet iron, there is practically no waste material, as the laminae may be stamped from sheet metal of the rectangular form indicated in Fig. 4 which illustrates the form of blank required for forming two laminae each having an extension 11. This economy is considerable as the waste material is of practically no value. Another advantage of this form of construction is the great strength secured, and without placing heavy strains uponthe main outside frame. The keys 6 and laminae form virtually an arch construction *which is selfsupporting and throughout which the strains are distributed without transmission to the main frame, thus enabling the main frame to be comparatively light. Another form of laminae for use in the stationary element is illustrated in, Fig. 15. In this case, e'ach lamina 14' has a straight outer edge and extends from one rib or key 6 to the second rib or key and is shown as extending to the middle of the rib at each end. In assembling the next layer, the laminae will extend between the intermediate set of ribs, and thus secure a break joint ar rangement and the broken or grooved out-- side surfaces giving the large radiating sur-. face as explained in connection with the form of laminae shown in Fig. 3. The" economy in stamping from' sheet metal is also effected. The form of laminae shown in Fig. 15 is well adapted for use in smaller machinesthan the" form'shown in Fig. 3.

In'Fig. 16 still" another form ofla'minae adapted for the stationary element is indicated. Each lamina 15 extends from one rib or-key to the second rib or key as in Fig. 15, but instead of extending to'the middle of each key,-the part 17 extends beyond the middle, and the part 18 falls correspondingly short of the middle. v This form results in a further breaking of the joints when the laminae .are' assembled. For example, the first layer of laminae may be placed as indicated by the full lines in Fig. 16; the next laye'vmay be placed to engage the intermediate keys with abuttingjoints on lines 19, then the next layer may engage the same set {of keys as, the first; layer, but with the laminae reversed forming butt joints on lines 20, and then the next layer'may engage "the intermediate set of keys with-the'laminae reversed and so form, the butt joints on lines 21, there thus being four difl'erent joints all breaking joints with each other. c i

In Fig. 17 another form of laminae is indicated and which is shown adapted for use on a rotating element, the outer periphery of the laminae forming the teeth for receiving the windings. The frame 22 of the rotating element is shown as having a number of arms, the ends of which are finished and have key-ways formed therein. In this case the laminae 23 have straight inner edges instead of curved as usual, and each lamina engages two adjoining arms of the frame and have end portions 24, 24 which extend half-way beyond the arms engaged; thus when one'layer oflaminae is assembled a completering is formed. When the next layer is assembled, the laminae are shifted circumferentially the distance of one arm which results in a break joint arrangement as shown in Fig. 17 Also the inner surfaces of the assembled laminae will be deeply recessed and provide very large radiating sur faces, as explained with reference to the form shown in Fig. 3. Likewise thereis great economy in reducing the amount of waste material in stamping the laminae as explained in connection with the prior forms.

Obviously the particular form of laminae may widely vary in different constructions while securing the advantages bf my inven-- tion, and the manner of assembling may be yaried in different constructions.-

Referring now to the rotating element of the machine shown in Figs. 1 and2, this in the particular form shown is made up of two separable supporting frames 25, 26, the latter being movable axially over the hub of theformer and clamping a segmental 'rim between them, th parts being held together by through b0 tsfi27. The form of laminae of which the rim is composed is shown in Fig. 7 each lamina 28 being formed in gen eralv in the manner already described with the straight edges on one side and so assembled over the bolts 27 as to-break joints and provide the large inner radiating surfaces. The laminae are subdivided in sections as shown in Fig. 2 spaced by, any desirable form ofseparator. A simple form of -separator well adapted for this construction; is that shown in Fig. 14. The same is formed of iron wire "and is bent so as to closely engage the bolts27 by the part 29, is extended at its upper portion to assist in separating the projections of the laminae by the part 30-and is provided with an extension 31 which extends below and engages .the inner surfaces of the laminae. The bolts hold the separators from vdisplacement, and the ex tension 31 prevents the separators from turning out of their proper position around th'eboltsxThe outer periphery of this laminated portion isprovided with dovetailed grooves which receive the dovetail extensions from the pole pieces. The pole pieces are laminated and the form of thelaminae is'indicated in Fig. 12. The laminae have extensions 32 forming-the pole tipsv and is slotted at 33 through the main Portion of the stamping except a comparatively short length at the outer end of the pole. At the.

inner end of the lamina: is formed an opening 34 adapted to receive pins Also at the innerend of the laminae is formed the dovetail 36 of a size adapted to fit in the dovetail grooves in the periphery of the laminated rim. At 37 are formed holes holes 34 and merely serve to keep the divided parts of the pole piece separated and so prevent the pole piece working loose.

In building up the pole pieces, the laminae are divided into sectlons as shown n Figs.

. 2 and 8, the openings 38 between sections corresponding in position to the openings in the laminated rim for ventilation. The spacing means used in the pole pieces is of such form as to secure a maximum amount of clear space for the passage of air. For thispurpose I use a wrought iron strip 39 of the form shown in Fig. 1 3, the end having the turn of larger diameter serving to engage and surround the pin and the end having the turn of smaller diameter surrounding and engaging the outer pin 35 which passes through the pole piece. This strip 39 therefore extends the length of the pole piece at the middle and presents very slight obstruction to the passage of air. On.

the two inner bolts 38 and the two intermediate bolts 38, may be placed spacing washers ifOl assisting in the separation of the laminated section. I also provide further means to separate the sections at the pole tips by bending over the tips 40 of the laminae adjacent into the ventilating.openings as shown in. Figs. 8 and'9. this means of spacing the sections of the pole pieces very little of the air space isoccupied by the spacing means. and the construction is at the same time simple and substantial.

The tips 32 of the pole piece serve to retain the field winding 4-1 in position at the sides of the pole pieces, and in order to support the end turns of the field coils from outward movement and to provide further means for ventilation. I provide end plates of novel construction. and also provide 'novel means for adapting these plates to withstand the great strain upon them. The

form of these end plates is shown in Figs.

9, 10 and 11. Each of these metal plates comprise a portlon 42 extending across the end of the pole piece and pole tips and hav- .ing slotted portions 43 to assist in the ventilation. The plate further consists of an outwardly extending part 44 which extends over the end turns of the field coils, and

serves as their outer support. Through this extension t l is an opening 4-5 through which passes the outer rivet bolt or pin 35. In the plate 4% are also formed radial openings 46 which provide further means for ventilation. On the inner face of plate 44,

and near the pole piece is formed an extension 47 having a slot 48, and the slots 48 in the opposite end plates of a pole piece receive a tie plate 49 which passes through the slot 33 formed in the lamime, and connected to the extensions 47 of the-end plates by pins 50. This construction not only occupies small space, but is one well adapted to withstand the great strains due to centrifugal force, the strains being taken up the tie plate 4.9. ;The construction also provides for ventilation of the field coils. The field coil ll as shown in Fig. 8 is of such form that at the ends it extends beyond the projections 47 and seats under the outer portions of the plates 44. Also between the outer laminae-0t the pole piece, I provide a distance piece 51 as shown in Figs. 2, 8 and 9. This consists of a narrow radial strip 51 and cross pieces which engage the end faces of the pole pieces. The strip 51 has an outer extension 53 extending out over the extensions 47 to keep the coil from directly engaging the extensions 47. These spacing pieces are preferably made of hard wood or other suitable material. It will thus be seen that the end turns of the field coils having comparatively large ventilating openings between the ends of the pole pieces and the end turns of the coil. The air can readily pass within the ends of the coil at the base from outside of the machine, and after passing up through the spaces on opposite sides of the stripol, it may then pass out through the openings &6 and 43 in the end plates.

Although I have described certain specific forms of my invention, it will be understood that various other modifications in construc tion may be made without departing from the spirit or scope of my invention.

Having thus described my invention. I declare that what I claim as new and desire to secure by Letters Patent, is:

1. In a dynamo electric machine, the combination of an exterior frame having inwardly projecting ribs, keys held by said ribs,.laminae held in fixed relation to, said ribs by said-keys, certain of said lamina: projecting radially beyond others, the edge of each lamina extending between the ribs being of a length less than the span of the ribs between which the laminae are disposed to thereby provide lateral spaces between the laminae and the ribs.

2. In a dynamo electric machine the combination of an exterior frame provided with ventilating openings and having transversely disposed, inwardly projecting ribs,

keys held by said ribs, laminae having distance between the ribs between which the laminae are disposed to thereby provide lateral recesses between the ribs and the laminze.

3. In a dynamo electric machine, the combination of an exterior frame having transversely disposed, inwardly projecting ribs, and laminae assembled in groups extending between certain ribs and held in fixed relation to the ribs, the length of the outer edges of said laminae being less than the span between the ribs between which the laminae extend to provide ventilating spaces between the groups of laminae and the ribs.

4. In a dynamo'electric machine, the combination of a frame provided with ventilating openings and having transversely disposed, projecting ribs. keys secured to said ribs, laminae arranged in superposed layers disposed between certain ribs and held by said keys in fixed relation to said frame, the edges of said laminae extending between the ribs being less than the span between the ribs between whichthe laminae are dis posed to thereby provide lateral-spaces between the laminae and the ribs.

5. In a dynamo electric machine, the combination of a frame having transversely disposed projecting ribs, said ribs being finished .on the arc-of a circle, keys engaging the finished circular faces of said ribs, laminae assembled in groups disposed between certain of said ribs, said laminae being held by said keys in fixed relation to the ribs, the edges of said laminae extending between the ribs being less than the span between the ribs between which the laminae are disposed, end plates engaging said laminae, and means between said end plates and said frame for retaining said laminae in position.

6. In a dynamo electric machine, the combination of a frame having a retaining plate intermediate its rims, ribs disposed on the inside of said frameand transverse to said retaining plate, saidretaining plate and said rims having ventilating openings, and

laminae arranged in layers forming the core, said layers of laminae lying in planes transverse to the length of said ribs, said layers being arranged with respectto eachother to provide ventilating circumferential recesses. i 7. In a dynamo electric machine, the combination of a frame having transversely disposed projecting ribs, said ribs being finished. on the arc of -a circle, keys engaging the finished circular faces of said ribs, lamina: disposed between certain of said ribs, the edges of the laminae extending between the ribs being less than the span between the ribs between which the laminae are disposed to thereby provide lateral recesses between the laminae and the ribs, and-said laminae further having laterally projecting portions.

8. In a dynamo electric machine, the combination of a frame having projecting ribs, said ribs being finished on the are of a circle,

said keys extending beyond the sides of said ribs, laminae held by said keys and positionedbetween certain ribs, the edges of said laminae extending between the ribs being of a length less than the span between the ribs between which the laminae are positioned to provide spaces between the ribs and the laminae.

9. In a dynamo electric machine, the combination ofa channeled frame, laminae disposed in the channelof said frame and supported on one side against a sideof; said keys fixed to-the finished faces of said ribs,

channeled frame, and adjustable means tending to spread the sides of said frame apart for holding said laminae' in'posit-ion,

said me'anscomprising an end plate positioned at the side of said laminae opposite said one side and an adjustable element held by said frame and abutting against said end plate. I

10. In a dynamo electric machine, the combination of a frame, laminae supported by the frame, and interlocking end plates overlapping the joints of said laminze for retaining said laminae in position.

11. In a dynamo electric machine, the combination of a frame, laminaesupported by theframe, interlocking end plates for retaining said laminae in position, and means between said end plates'and the side of the mainframe for holding said end plates from axial movement. I

12. In a dynamo electric machine, the combination of a channeled frame, laminae disposed in said channel and supported on one side against aside of said frame, and

- means tendingto spread the sides of said frame apart for holding said laminae in position, said means comprlsing an end plate engaging said laminae on a side opposite to said one side and a bolt abut-ting against said end plate and in screw-thread engagement with the other 'side of said frame.

13. Ina field pole for a dynamo electric machine, the combination with the pole piece and field winding, of end plates ex tending over the outer endof said winding, said plates having inwardly extending projections lying in a plane which contains the axis of the machine, and means passing through the pole piece connecting said projections.

'14. In a dynamo electric machine, the com-bination of the pole piece, a field winding, end plates extending over the outer end of said' winding, each of said end. plates having radially extending parallel plates, and a tie-plate passing through the pole piece and between said, radially extending plates of each end plate.

15. In a dynamo electric machine, the

combination of a pole piece, a winding.

of the pole piece for providing ventilating" spaces within the end turns.

16. In a dynamo electric machine, the

combination of a polar projection, a winding thereon having a Ventilating space between the end turns of the winding and the ends of said polar projection, end plates extending over the outer ends of the winding and having projections extending within said space, said projections lyingin a plane containing the axis of the machine, and a connecting means passing through the pole piece connecting said projections.

17. In a dynamo electric machine,the combination of a laminated polar projection having the laminae'divided in sections, bolts passing through the polar projection, and a spacing strip between said sections extending the length of the polar projections substantially and the said strip encircling certain of s'aidbolts at its ends.

18. In a dynamo electric machine, the combination 'of a frame, laminae supported by said frame, means passing through the laminae for holding the laminae together, and meansfor separating the laminae comprising an iron wire engagingisaid first named means and bent over the outside of the laminae.

19. In a dynamo electric machine, a laminated polar projection having extended tips, said laminae beingdivided into sections and having an air space between them, the laminae adjoining said air spaces beingbent over atthe tips for spacing the. sections, bars passing throu' means around said bars. i

20. In a dynamo electric machine, a frame, pole pieces having their inner ends' .embedded in said frame, the said pole pieces being laminated and slotted lengthwise, means inserted between the divided parts of the pole piece for spacing said parts, and means extending through said slots for supporting the field coils.

21.. In a dynamo electric machine,the combination of a channeled frame having an integral retaining plate disposed within the channel, ribsprojecting from said frame lying ransverse to the channel thereof, laminae supported by said frame engaging said. plate and disposed adjacent said ribs,

gh said laminae, and spacing 1,osa,ave

an end plate for the laminae, and adjustable means between the end plate and the inside of the main frame for'retaining the end plate in position.

22. In a dynamo electric machine, the combination of a frame having projecting ribs,

' keys held by said ribs, laminae of the same size and shape held by said keys in fixed relation to said ribsand disposed between certain of said ribs, the edges of said laminae extending between the ribs being less than the span between the ribs between which the laminae are disposed.

.23. In a dynamo ele'ctric machine, the com bination of a channeled frame having an integral retaining plate disposed within the" channel, said plate having air passages communicatlng with air passages n the runs of said channeled frame, laminae supported against said retaining plate on the inside thereof, said laminae being spaced from the inner side of said frame, end plates disposed on the side of said laminae opposite said retaining plate, and bolts for adjusting the I pressure exerted between said end plates and the sideof said channeled frame.

24. I11 a dynamo electric machine, the combination of a channeled frame having an integral retaining plate disposed within the channel, ribs projecting from said frame and lying transverse to the channel thereof, keys on said ribs,'laminze supported by said keysand held by the same spaced from said ribs, saidlaminae being of the same size and shape and arranged in layers which are staggered in relation to each other so as to provide breakingjoints and circumferential recesses, and adjustable means for adjusting the pressure exerted between said laminae and the sidfof said channeled frame.

25. In a dynamo electric machine, the combination of a frame having projecting ribs, keys held by said ribs, laminae of the same size and shape held by. said keys in fixed relat-ion to said ribs and disposed between certain of said ribs, the edges of said laminae extending between the ribs being less than the span between the ribs between which the laminae are disposed, said laminae beingshifted relatively to one another to provide radially projecting portions. 7

In testimony whereof I afiix my signature, in presence 0 two witnesses. I

' JAMES BURKE.

WVitnesses:

L. K. SAGER, Y Gno. A. HOFFMAN. 

